nicrtl.c File Reference

#include <cfg/os.h>
#include <cfg/arch/avr.h>
#include <cfg/dev.h>
#include <string.h>
#include <sys/atom.h>
#include <sys/heap.h>
#include <sys/thread.h>
#include <sys/event.h>
#include <sys/timer.h>
#include <sys/confnet.h>
#include <net/ether.h>
#include <net/if_var.h>
#include <dev/irqreg.h>
#include <dev/nicrtl.h>
#include "rtlregs.h"
#include <sys/osdebug.h>
#include <net/netdebug.h>

Include dependency graph for nicrtl.c:

Data Structures
struct	nic_pkt_header
Defines
#define	NUT_THREAD_NICRXSTACK   640
#define	RTL_EE_MEMBUS
#define	RTL_EESK_PIN   PINC
#define	RTL_EESK_DDR   DDRC
#define	RTL_EE_MEMBUS
#define	RTL_EEDO_PORT   PORTC
#define	RTL_EEDO_DDR   DDRC
#define	RTL_EE_MEMBUS
#define	RTL_EEMU_PORT   PORTC
#define	RTL_EEMU_DDR   DDRC
#define	RTL_SIGNAL   sig_INTERRUPT0
	Interrupt used.
#define	RTL_RISING_EDGE_MODE()   sbi(EICRA, ISC00); sbi(EICRA, ISC01)
#define	NIC_PAGE_SIZE   0x100
	Size of a single ring buffer page.
#define	NIC_START_PAGE   0x40
	First ring buffer page address.
#define	NIC_STOP_PAGE   0x60
	Last ring buffer page address plus 1.
#define	NIC_TX_PAGES   6
	Number of pages in a single transmit buffer.
#define	NIC_TX_BUFFERS   1
	Number of transmit buffers.
#define	NIC_FIRST_TX_PAGE   NIC_START_PAGE
#define	NIC_FIRST_RX_PAGE   (NIC_FIRST_TX_PAGE + NIC_TX_PAGES * NIC_TX_BUFFERS)
#define	NIC_CR_PAGE0   (0)
#define	NIC_CR_PAGE1   (NIC_CR_PS0)
#define	NIC_CR_PAGE2   (NIC_CR_PS1)
#define	NIC_CR_PAGE3   (NIC_CR_PS1 | NIC_CR_PS0)
#define	NICINB(reg)   (*((volatile uint8_t *)RTL_BASE_ADDR + reg))
#define	NICOUTB(reg, val)   (*((volatile uint8_t *)RTL_BASE_ADDR + reg) = val)
Functions
void	NicRx (void *arg)
	NIC receiver thread.
int	NicOutput (NUTDEVICE *dev, NETBUF *nb)
	Send Ethernet packet.
int	NicInit (NUTDEVICE *dev)
	Initialize Ethernet hardware.

---

Define Documentation

#define NUT_THREAD_NICRXSTACK   640

Referenced by NicInit().

#define RTL_EE_MEMBUS

#define RTL_EESK_PIN   PINC

#define RTL_EESK_DDR   DDRC

#define RTL_EE_MEMBUS

#define RTL_EEDO_PORT   PORTC

#define RTL_EEDO_DDR   DDRC

#define RTL_EE_MEMBUS

#define RTL_EEMU_PORT   PORTC

#define RTL_EEMU_DDR   DDRC

#define RTL_SIGNAL   sig_INTERRUPT0

Interrupt used.

Referenced by NicInit().

#define RTL_RISING_EDGE_MODE

(

)

sbi(EICRA, ISC00); sbi(EICRA, ISC01)

Referenced by NicInit().

#define NIC_PAGE_SIZE   0x100

Size of a single ring buffer page.

#define NIC_START_PAGE   0x40

First ring buffer page address.

#define NIC_STOP_PAGE   0x60

Last ring buffer page address plus 1.

#define NIC_TX_PAGES   6

Number of pages in a single transmit buffer.

This should be at least the MTU size.

#define NIC_TX_BUFFERS   1

Number of transmit buffers.

The initial value had been 2. The idea was to use two alternating buffers. However, this had never been implemented and we took over Bengt Florin's change, defining 1 transmit buffer only and give more buffer space to the receiver.

The controller memory layout is now

• 0x4000..0x45ff 1.5K bytes transmit buffer
• 0x4600..0x5fff 6.5K bytes receive buffer

The routines are still not using the buffers in an optimal way, as transmission is limited to 1 packet at a time. In fact several smaller packets would fit into the 1.5 kByte buffer. On the other hand, filling the buffer with more than one transmission packet may result in other bad effects, like pulling the IORDY line more often.

#define NIC_FIRST_TX_PAGE   NIC_START_PAGE

#define NIC_FIRST_RX_PAGE   (NIC_FIRST_TX_PAGE + NIC_TX_PAGES * NIC_TX_BUFFERS)

#define NIC_CR_PAGE0   (0)

#define NIC_CR_PAGE1   (NIC_CR_PS0)

#define NIC_CR_PAGE2   (NIC_CR_PS1)

#define NIC_CR_PAGE3   (NIC_CR_PS1 | NIC_CR_PS0)